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https://doi.org/10.1016/0301-0104(88)87175-1
Copy DOIJournal: Chemical Physics | Publication Date: Feb 1, 1988 |
Citations: 10 |
The phosphorescent triplet states of a series of aromatic thioketones exhibiting unusually large zero-field splittings (ZFSs) have been investigated by optically detected magnetic resonance spectroscopy (ODMR) in zero applied magnetic field at 1.2 K. Molecules examined include 4H-pyran-4-thione (PT), 2,6-dimethyl-4H-pyran-4-thione (DMPT), chromthione (CT), xanthione- h 8 (XT) and xanthione- d 8 (DXT). The ZFS parameters and the individual sublevel decay rate constants of the lowest excited 3(nπ*) triplet state (T 1) are compared in the series. The phosphorescence of these thioketones consists of two optically resolved subspectra which are assigned to the (T x , T y ) and T z ; triplet sublevel manifolds of T 1; they are split by an unusually large ZFS parameter, D. The temperature dependence of the relative intensities of the subspectra originating from a highly resolved n-alkane Shpol'skii matrix is consistent with the populations of the two sublevels existing in thermal equilibrium over the temperature range examined.
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